Automatic message numbering telegraph transmitter



Oqt. 12, 1948.- M. POTTS 2,451,045

AUTOMATIC MESSAGE NUMBERING TELEGRAPH TRANSMITTER Fil ed Dec. 20, 1943 3 Sheets-Sheet l I WAY/1m?! |4 I06 INVENTOR LOUIS M. POTTS ATTORNEY L. M. POTTS Oct. 12, 194s.

AUTOMATIC MESSAGE NUMBERING TELEGRAPH TRANSMITTER Filed Dec. 20; 1943 3 Sheets-Sheet 2 INVENTOR LOUIS M. POTTS ATTORNEY Oct. 12, 1948. 1.. M. IPOTTS 2,451,045

AUTOMATIC MESSAGE NUMBERING TELEGRAPH TRANSMITTER INVENTOR LOU IS M. POTTS ATTORNEY patented Oct. 12, 1943 AUTOMATIC MEssAGaivUMRERING TELEGRAPH TRANSMITTER Louis M. Potts, Evanston, 111., assignor to Teletype Corporation, Chicago, 111.,-

Delaware a corporation of I Application December 20, 194-3, Serial No. 511L888 v 25'C1aiins.

. 1 The present invention relates to telegraph transmitting apparatus and more particularly to telegraph tape transmitting apparatus provided with automatic auxiliary .signal control mechasuch as for introducing serial message numbering .signals in accompaniment with consecutivemessages.

telegraph oflices where messages .are accumulated for transmission over extended or interexchange lines, the practice has been followed of manually noting seriatim consecutive messages in. order that there may be made available a method: for instantly identifying each message according to its sequence of the day. and in order that periodic checking or verification may be had todetermine the chronological propriety of telegrapn traffic.

It is, accordingly, the principal object of the present invention to achieve the purpose by providing a consecutive message numbering operation automatically in response to a. designating signal. r

Anotherobject of the invention is the provision oi iapparatus operative in response to an end of message signal for recording the number of said message by numbering apparatus operative auto.- matically in response toxsuchsignal.

'With the foregoing general object in view, there is proposed herewith several embodiments of au-' tomatic telegraph transmitting apparatus having incorporated therein an automatically initiated auxiliary device for transmitting-signals pertaining tic-message identification. .In each of the embodiments proposed; the objects of invention area-ttained- :by the use of two control forms passing through 'a single sensing apparatus. Each of the control forms .is provided with its individually-actuated propelling mechanism. and each is advanced from one rest position to another... Duringthe :dormanoyof each,"the .alterna tive "form is initiated and permitted to advance the latter attains its rest position. One embodiment presumes 'arpractice in which one of the control tornis is provided with number features proposed in connection with this enibodi merit-is the provision of local selecting apparatus responsive to certain. endoi message signals voc-- curring m said 'form'ior transferring the control-- from one to the other at'predetermined instants during the course :of multiple message trafiic' or similar" signaling condition.

In an alternative method of achieving the aboveustated objects. there is proposed a method of auxiliary tape transmission to accompany it principal tape bearing a succession of messages or similar separated items of information whereby the auxiliary tape is provided with an accord-"- pariying signal for denoting the instant when supervision is restored to the principal control form. In this adaptation there is featured the funther advantage of affording variable amounts of'superv'isory control on the part of each, the principal and auxiliary control forms, iii con trast with the alternative ractice in which the auxiliary form is predetermined in "its extent or control. r

Having declared briefly the principal objects and features of the present invention, reference will now be had to-the accompanying drawings and to the detailed description following hereinafter in which like reference characters des'ig n-ate corresponding parts throughout, and in which;

Fig. lis a perspective view of one embodiment ofthe present invention having various portions broken away;

Fig. 2 is a plan View of the embodiment ofthe present invention featured in Fig. 1;

Fig. 3 is a front elevation of the apparatus illustrated in Figs. 1 and 2, from which the supe'rv'isory control forms have been omitted for the sake of clarity;

Fig. 4 isa transverse sectional View taken" ap-' proximately on line '4-4 of Fig. 2 showing frag" mentary portions of the principal and auxiliary" I supervisory forms in position for operation;

Fig. '5 is a transverse sectional view taken approXi-matelyon line-'5-5 of Fig. 2;

Fig. '6' is a planview of a control form fragment such as may be utilized in performing the aux iliary function of consecutive numbering supervision; I v

Fig. 7' is a plan View of a control form frag-'- ment such as ma'y' b'e' utilized in bearing the" principal message mate-rial in a system, such that featured Figs. 1 to 5,- inclusive, and

Fig. '8' is a transverse sectional view generally resem ldl-ing Fig. 4 but featuring an alternative emboeiinent of apparatus in' which a selective and variable control is invested in the auxiliary" control form as well as in' the rincipal :form.

In each of the embodiments, which will now be described in detail, a principal tape transmitting structure iscontemplated having the essential det 'ilssand features of that mechanism shown in Patent No. 2;296;845.

Referring now more particularly to the first mentioned embodiment featured in Figs. 1 to 5, the reference character I designates a base plate upon which there are supported two vertical end wall brackets l2 and I3 strengthened by a transverse bar l4. In addition to this framework structure there are also provided two supporting posts l5 and I6 and a table plate H. The principal drive shaft l8, Figs. 3 and 4, is journaled in the and brackets l2 and I3 and has secured to it a principal driven gear I9 which receives counterclockwise rotation, Figs. 4 and 5, from a suitable driving source, not shown.

On the shaft [8 there is carried an integrally associated driving element 2| of a beveled tooth clutch coupling whose cooperating member 22 is freely rotatable on said shaft l8 except when its teeth are engaged by those of the driving element 2|. Member 22 is loaded by a thrust spring 23 but may be withheld from engagement with its driving member 2| during the interposition of a clutch control armature 24 when the latter is in its unattracted position, Fig. 5, a condition urged by return spring 25 and opposed during the energization of magnet 25. Member 22 is provided with a tenon 27 slidable within an appropriate recess in a sleeve 28 and thereby the rotary motion when imparted to the driven member 22 of the tooth clutch is communicated throughout the sleeve assembly 28 including a series of cams carried thereby and more detailedly described hereinafter.

Of the several cams included on sleeve assembly 28 five relate to the supervision of the five code signal gooseneck levers 29 and one relates to'the normally closed-contact gooseneck lever 3|. These cams are generally similar to each other in contour and each one is provided with a notch or recess during the disposition of which, at the lowermost point in its respective cycle, the associated gooseneck lever 29 or 3| is permitted to be moved in a counterclockwise direction, see especially Figs. 4 and 8, under the influence of its contactor spring 32. The surface of each cam following its notch is beveled so as to restore the lever to the contact separating position and since the notches are arranged in a spiral succession there is effected a time distribution of the signal cycle.

A seventh gooseneck lever 33 pivoted on the shaft 34 together with the other gooseneck levers 23-and 3| differs from the general class in contour, as best indicated in Fig. 4, by reason of its downwardly and rightwardly extending tail portion 35. This member functions to suspend transmission when the end of the message bearing tape is encountered in accordance with the plan disclosed in the patent referred to above.

This gooseneck lever 33 is itself not directly affected by one of the cams on sleeve 28. Its disposition is indirectly so affected, however, through the infiuence of a companion lever 36, Fig. 4, and

v the clockwise position of lever 33 may be maintained when the extremity of its tail portion 35 is latched behind the shoulder 31 of a bell crank lever 38 pivoted at 39 in a suitable bracket on the base plate H and urged in a counterclockwise direction by its spring 4|. The arrangement of the several transmitting cams of sleeve 28 as well as that of the cam which serves the normally closed gooseneck lever 3| is in accordance with theconventional practice well known in startstop telegraphy. The cam (not shown) which serves the auxiliary lever 36 in association with the special gooseneck lever 33, constitutes the subject matter disclosed in U. S. Patent No. 2,296,845.

It is to be observed from Figs. 1 and 4 that while gooseneck lever 3| terminates at its horizontal portion with a follower projection 42 which is in transverse alignment with corresponding follower projections on the transmitting gooseneck levers 29, said gooseneck levers 29 do not so terminate but extend rightwardly beyond, as seen in Fig. 4, and are each provided with a shouldered extremity 43 of which the several lie in the vertical planes of respective blocking portions 44, Fig. 4, of a set of five feeler levers 45 pivoted on a horizontal shaft 46 and having horizontally disposed feeler arms provided with tape or control form probing pins 41.

Each one of the set of five feeler levers 45 is provided with an individual spring 48, Fig. 4. Its horizontal arm terminates in a characteristic notch and lug extremity 49, Figs. 1 and 4, so that as the several feeler levers 45 assume a tape penetrating or tape blocking position as the case may be, the notched extremities 49 constitute a coded area to a transverse probing bail 5|. The coded notch and lug distribution on the foremost ends of the sensing levers 45, Fig. 1, is such that during the sensing of that code combination which pertains, in accordance with an arbitrary designation, to the conventional alphabetical character J, a clearance will be afforded to the transverse bail or bar 5| permitting the lever 52 which is integrally formed therewith to move counterclockwise to its full extent of motion about pivot 53 under circumstances which will be more fully described later.

The other end 54 of the sensing levers 45 are also notched so as to provide a coded clearance to a transverse bail 55, but in this instance the code represented by the notchings relates to the figures-shift signal and under circumstances of sensing this code combination signal, a clearance is afforded which will permit the rise of the transverse ball 55 carrying with it lever arm 56 at a significant instant in the cycle as determined by a recess in one of the cams during which a lug, integral with lever 56 and generally resembling the lug 42 of gooseneck 3| enters under impetus of a spring, not shown, but urging said lever 56 in a counterclockwise direction about pivot 34.

From the foregoing it will be understood that the set of sensing levers 45 in addition to performing as conventional tape control means for conditionin the transmitter contacts, also provide through their coded portions at their opposite extremities 49 and 54 means whereby supervisory controls are achieved in response to certain individual code characteristics. Cyclically the tape sensing levers 45 are withdrawn from their tape sensing position when a restoration bail 51, see especially Fig. 4, is rocked in a clockwise direction about pivot 46 under the influence of a spring which is of sufficient tension to overpower the several springs of the feeler levers 45 collectively and timed by the follower roll 59 which follows the periphery of a cam 6| also carried by the sleeve 28 for this purpose, see Fig. 5.

The low portion of cam BI is of comparative short angular duration so that bail 51 during its restorative position, so far as the feeler levers 45 are concerned, occupies but a brief time interval of the complete cycle as understood in terms of the rotation of shaft l8. On the other hand, its

apex is of extensive duration permitting the sev-.

eral feelers 45 to assume their tape sensing position durin the major portion of each rotary cycle assho e of shalt it. This practice seemlvenuonar-m printing telegraph tape transmittingapparatus an maybe ascertained by reierrin to the abovementioned patent. It is repeated here for the purpose of affording a ready understandingci the relative-timing of the several elements in terms of-th'e added elements which constitutethe emb'odiment of the present invention under descrip tioflas will be later explained.

' hlso pivoted-on shaft 48 together the feeler levels 4% and their operating ball 5 l is a bell-crank twigs. 4 and 5, the short arm of which is providedwith a follower roller "64 through it pursues theperiphery of a tape feed cam '88 also situated on the assembly 28, ana having-a longann which carries a ivot shait'fi'i that-gives support'to the feed pawls 66 and 6'1. Pivot ears on bot-h the p'awlsfifi and 61 are bent oppositel so as to 'form 'yokes 'withthe upright portions thereof, and eppositeone another as best indicated in Fig.5. Paw] 6*! has integrally formed therewith an uppermost tail extremity 68, and. in contrast therewith pawl 6 6 integrally formed a lowermost tail portion 69, and between the two tails fl' and -69 there is adapted to be disposed a horizontal'control transfer rodll.

:Paw'l 6B is considerably longer than pawl 61 and I is urged in a clockwise direction about its supporting pivot '55 through the influence of a spring 12, while 'pawl'iil is influenced ina counterclockwise di'rection about :pivot '65 through the influence of a spring i3i The extent to which each pawl 66ori61 may respond to the influence of its" spring =72 or 13 respectively is determined bythe point-at which its tail 68 or 69'engages the control rod H, Fig. '5. Rod H is shi-rtable .laterally in correspondence with the shifting of its supporting bar '24, Fig. l, oneend oiwhich is pivoted at. 1 5 to a vertical :arm of a bell crank lever 16 while the opposite extremity is alsotpivoted' at Htca link 18 the upper end of which is pendulously-supported .as at 19 from ashaftcar riedby-one'armof the bellcran-k lever 81. :Since the bell crank lever 8| is itself carried in a stationary pivot 82 and-since the bell'crank 76 is: also stationarily pivoted at :83, it follows that bar it and hence horizontal'shaftli will be movabie laterally in a relative parallel motion, and that when rod H is disposed in its right-hand extreme :pos'ition, tail -69 will withhold the :uppermost ;:extremity of pawl 66 from engaging a ratchet wheel 8% of an uppermost tape feed shaft 85 :whiie the lowermost tape feed-shaft 86 has its ratchet wheel 8:! engaged by the pawl 61. On the other hand when shaft H is moved to its extreme leftward position, Fig. 5., the condition of the pawls 66 and E! is reversed, and pawl 66 is permitted to come into engagement with its ratchet wheerm while pawl *6! ls-withheld from engagementiwith its ratchet wheel 81. I 'fi' Carn follower roller '64 pursues the periphery of cam 88, '5, impartin to the bell-crank lever 63 'a brief counterclockwise movement upon encountering the-comparatively shortlo'w portion of said-cam 88. The apex portion of the cams periphery is ofextensivecyclicduration, hence the clockwisedormant position of beil crank'SE is of relatively long duration. During the' -courseof a cycle, bell crank 63 describes 'a' to and fro clockwise and counterclockwise motion causing thepivotal center 65 to'bereciprocated in a generally vertical direction and causing the pawls 6 B and i l to be thrust first upwardly andt'hen downwardlygand'the one of them which'happens to be 'engagihg its' ratchet 81 or -8'!- correspond ingly imparts rotation of a limited angle thereto. It is to be noted that pawl 61 imparts counter clockwise rotation to its ratchet wheel 81 and hence to shaft 86 while pawl 6-6 imparts clockwise rotation to its ratchet wheel 84 and hence to shaft 85. 'Whfle the effects ofshafts 85 and 86 turning-in opposite directions appear to oppose each other; the proportions of the respective elements carried thereby are identical so that the motion imparted to a tape feed sprocket-.89 carried by shaft 86 and that of a sprocket 91 car'- ried by shaft t lt-is identical so far as tape passing through the zone intermediate the two driving elements is concerned.

In Fig. 4 the reference numeral 92 represents a sequence numbersignal bearing perforatedacontrol form, while the one indicated 93 represents a general message matter bearing control form The distinction between the two forms in ageneral sense may be disregarded or considered only in "respect to the comparative frequency with which the two-control forms are employed. Form 93 is contemplated "to be of relatively longer operational performance while that of 192' of comparatively shorter duration. This classification is arbitrary and conceivably may be reversed in respect to the disposition of the two tape feed devices; l i

Shaft85 carries, in addition to the 'afore-mem tionedratchet wheel B and tape feed sprocket 89,-a multiple apex cam. and the auxiliary ratchet feed wheel '95; 'The More-described. elements '94 and are provided "with .five equally spaced sections, the cam 84 having five apices and the auxiliary: tape feed sprocket wheellflfi having five feed teeth. I This arrangement :is made toaccord with the chance conditions rot commercial apparatus, since sprocket feed wheels ofthis class are made-with thirty-five feed pins and "since each member, transmitting groups of signals, requires, including the four integer signals, a total of seven signals. It may-be observed from 6 thatthle number tape 92 is provided with twocontigunusrub-out (all-marking) signals at the end of each number whereas but one might be expected to suifice so far as affording clearance to the feelerlevers 45 is concerned. This precaution is suggested in orderto be able to advance the cam 94- for restoring the bell crank 8 I immediately following its performance. as will beexplained later. Thus a paw1'90 has beenprovidedup'on arm 63, which engages the related tooth of ratchet wheel 95 causing shaft 85 to be advanced one step after the first all-markingsignal has been sensed and though the control is thereby effectively transferred to the lower shaft '86.

Upon 'ea-ch 'stepped advancement of shaft 85' under impetus of the 'feed pawl 66, the position-is retainedthrough'the influence of a detentjockey 98, Fig. 5,wh'ich'consists of a bell crank lever 91 pivoted as at 98 and having a detent pin that is spring urged to rest between the ratchet teed teeth of wheel-'81 as each position is attained during the reciprocal movement of pawl 66. The lowermost *tape'feed ratchet wheel :81 is sinii-' larly provided but in this instance the detent jockey!!!) is carried by onearm of-a three-armed lever pivoted at T0] and urged'ina counterc1ockwise direction by a spring 102. Another arm I03 of the'thre'e-armed leverterminates with a lobe ior en'gaging the lowermost extremity of pawl 51 so that when 'this lever'is rotated clockwise "against the influence of "its spring W2, lobe arm 103 will engage and-withdraw-pawl 61 from its ratchet wheel 81 independently of the afor'e-ds''ribed arrangement of control under the influence of control pin I I.

From Fig. 4 it will be noted that the teeth of sprocket wheel 89 engage the perforations of uppermost control form 92 while those of sprocket wheel SI engage the perforations of the lowermostcontrol form 93. Since, in accordance with the supervision of control transfer shaft II, as afore-described, but one or the other of the tape feed sprocket wheels 89 or 9| may be operated, it follows that the advancement of the tapes 92 and 93 are effective only under individual conditions and that except for the single step operation under impetus of pawl 99, the sprocket wheels never are advanced together.

The three-armed lever which carries the detent jockey 99 includes a horizontal arm I04 which is engageable by a short stud pin I95 carried as an integral part of push bar I66. The latter element is confined for vertical motion and is spring urged to maintain its uppermost position, Figs. 1 and 4, whereat the pin I95 is poised above arm I04 until said push bar I06 is depressed by the manual application of force on its over bent top portion IO'I.

The purpose of push bar I96 as may be understood by referring to the patent mentioned above, is primarily for restarting the transmitter apparatus after it has been brought to rest upon the occurrence of an end-of-tape signal manifest upon a special sensing lever provided for this purpose. Also in Withdrawing detent 99 and permitting shaft 86 to run free, this bar constitutes a means for rethreading a new tape onto the lower feed sprocket 9I. As a further consequence of its depression, another horizontally extending stud pin I08 thereon engages the arm 38 of bell crank lever 31 which may be latching the extremity 35 of gooseneck 33 and thereby releases the latter member, reinstating the relative disposition of parts as illustrated in Fig. 4, and thereby permitting the resumption of tape transmission.

Supported upon two parallel horizontal pivot shafts I99 and III there may be noted three pawl levers H2, H3, and H4. Of these, lever H2 is pivoted on shaft I99 and is .provided with a stop shoulder or tooth II opposite similarly provided stop shoulders or teeth H6 and III on the levers H3 and H4, respectively. It is to be noted that of the three shoulders, II'I on lever H4 is of a slightly higher level than shoulder I I5 of lever l I2, which, in turn, is correspondingly higher than the shoulder II6 of lever II3. This arrangement is provided to regulate the performance of bell crank lever I6 having a sidewardly extending lug IIB formed on its horizontal arm. As the several levers H2, H3, and H4 are selectively actuated, they permit the passing of lug I I8 downwardly as will be hereinafter more fully described.

Blocking lever II 2 is provided with a spring for urging it in a counterclockwise direction about pivot I09 while levers H3 and H4 are provided with springs for urging them in clockwise direction about their common pivot III. Levers H2 and H3 may respond to the urge of their respective springs until the lowermost extremities of the two come into abutment respectively with a limit pin H9 secured to the horizontal slide bar I2I and a fixed pin I44 carried by the frame. The mid-portion of slide bar I2I also carries the afore-mentioned pivot 53 at which the lower extremity of lever 52 is articulated thereby determining to an extent the nature of movement of said slidable bar I2 I.

In addition to its pivotal support at pin 53, horizontally shiftable bar I2I is also pendulously supported at its left extremity, Fig. 4, upon a pivot pin I22 which resides in an elongated horizontal slot I23 in said slide I2I, Accordingly, except for the restraint which is had through bell crank lever 16, bar I2I is free to slide in a horizontal direction longitudinally of itself with its rightward end pivoting in an arc about shaft 83 as a center and its leftward end constrained to a more nearly parallel motion as defined by the slot I23 and. its contained guide pin I22. A spring I24, Figs. 1 and 4, imparts a rightward pull to the slide bar I2I causing it to seek the position indicated in Fig. 4 whereat the pin I22 is disposed in the leftmost extremity of slot I23 While pin I I9, integral with bar I2I, assumes a relationship with respect to levers I I2, II 3, and I I4, such as that illustrated.

Pin I22 is carried by the lower extremity of an arm I25 which is integral with the feeler lever restoration bail 57 and therefore, responds in accordance with the movements of roller 59 that rests upon the periphery of its associated cam 6| on cam assembly 28. Through this arrangement the relative position of pin I22 will vary in accordance with the contour of said control cam. As indicated in Fig. 4, follower roller 59 has assumed its leftmost condition; that is, riding the lowest portion of said cam. At other times when the roller is moved rightwardly by cam 6|, pin I22 will be disposed in a position to the right of that shown in Fig. 4, permitting bar I2I to respond to the influence of its spring I24. This movement on the part of bar I2I may thereafter be restrained, however, when its integral lug I26 encounters the overhanging lip I21 of a latch lever I28 pivoted at I29 and urged in a clockwise direction by a spring I3 I.

When the latch lever I28 is lifted, that is, moved in a counterclockwise direction about its pivot I29 on account of the raising of horizontal arm I32, a member integral with the afore-described figures shift signal bail 55, then the lip I2'I is withdrawn from the path of shoulder I26 and bar I2I is then permitted to be moved rightwardly to an extent further than that when confined by the described latching lip and lever I28.

Wh'en latch bail I28 is moved counterclockwise about its pivot I29, a downwardly disposed arm I33 thereof overrides the shoulder I34 of a secondary latch I35 and in so doing becomes disposed in front of said shoulder I34 thereby latching itself in counterclockwise position so as to hold its lip I21 poised above the shoulder I26 under restraint of the secondary latch I35. This condition is maintained by a spring that urges secondary latch I35 in a counterclockwise direction and may be released only when the upstanding lug I36 of said secondary latch is encountered by the lobed arm I37, an appurtenance formed with an auxiliary lever I38, Fig, 1. This lever is disposed adjacent the conventional No. 3 code impulse gooseneck lever 29 and is subjected to its associated feeler lever extremity I39 which is bent over as best indicated in Fig. 1. so as to be able to block both the regular No. 3 gooseneck lever as well as the special or auxiliary lever I38.

In Fig. 1 there may be noted the vertical portions 54 of the several feeler levers 45 of which the two foremost ones have been broken away revealing as whole levers those only that relate to the Nos. 1, 2, and 3 signal impulses and not those relating to the'Nos. 4 and 5 impulses. Of

assumes sensing lever, :but'also the :special :lever [-38 havingithe afore-mentionedlobe Blah-deserving the purpose-of releasing the secondary latch 13.5.

From this, it :follows that when in accordance with-any codesignal, the No. .3ieeler lever is placed inriits marking (counterclockwise, Fig. -1) position, the blocking lug 4:39 is removed ,from {interposition over thehorizontalsectiom of levers 38 and 29. However, when this particular -feeler is disposed in spacing -(c1ockwise) position, then blocking lug 43.9 is disposed to obstmct counterclockwisemovernent of both of the afore-described levers 29 and :t38. When ,the latter condition obtains, then lever Hi8 fails toibermoved-counten clockwise when the notch in its associatedcam is presented as in the manner of operating the general ,class of ,goosenecklevers :29, and its lobe J37 willQfail toactuataandreleasecatch 135. In

the event, however, thatthis lever 138 is moved, I

such movement causes lobe l 3.1 to execute the afore-described releasetoperation of latch I35,

Attention 'will vnow again .begiven .to the horizontally shiftable bar 121 and to the three-blockingpawls H2, ..l i3, and 114,, which it .controls through the agency ofzitsintegral pin H9. When the apex of cam 6! .moves roller 59 frightwardly, and therebyith'rustspin A22 [in thesame direction, longitudinal bar l2! moves -.in {response to its spring I25 and .pin MB {thrusts ,against the lowermost extremity of. lever H3. ,Meanwhile, lever i l 2 ,moves in va counterclockwise direction about pivot I59 under influence of its spring as pin 9 advances. .As ,a result,.sidewardlyben-t section I [8 of bell .crank L6 ,rides ofi theshoulder 4 H of lever H4 and is immediately supported :by the shoulder H'Soflever 11.2. The .extent to which bar 123 maymove to theiright will depend upon whether the coded extremities 49 of .the several 'feeler. levers .are .disposed .in vaccordanceiwith the code combination for the .letter .J. This contingency .may .not now obtain for the signal which has just served in releasingbar I21 is .not the letter J signal but instead the figures shift signal. Hence, bar .51 will at this instance be obstructed fbyzthe logs .of some of the feeler levers 35.

incidentally, it is to be -noted that the feeler pins ill of the feeler levers 45 are of suflicient length to protrude through .both thicknesses of the control .formsiliz and 3. Sincecontrol form 83 has been arbitrarily disposed beneath control form 92, it will be ,understood that for a proper sensing operation of .tape .92., .the perforations in the control form 93 .Will necessarily be required infall positions .as .in the -.case of a conventional rub-out signal. ,Also,'. in order to properly sense variable code combinations .in the tape .83, the uppermost control Iorm.-.92 will need to be disposed so .as to present asimilar rub-out signal in the tape sensing position. Since the two control forms 9.2 and "53 .are advanced individually, it

follows that the inert one of the forms will of necessity have tobearrested with a rub-out signal lisposed in the 'tapesensing position.

By referring now to Figs. -.6 and .it will be noted that the message numbering control ,form

9.2 :is designated .as ,having two rub-out .signals ifollowing' :in succession sand, thereafter, :a figures :sh-if-t ;-signa-l :havingmarkings in the :1, 2, and 4, 5 positions. These code-combinations are then folflowed :by 'four znurnerical integer :code -c;ombina-- stions in :Fig. 6 :illustrated:as being if or the;number-s 2708:and 270.9,,there'zbeingzshowna length of tape coextensive-withtwo complete numbering setsof :signais. 7 q

The tape fragment featured in Fig. 7 ,pertains to general message zmatter. It is provided with but :a single .rub-out signal :followed by certain well-known signals ,pertaining to the preamble portion Y of a conventional telegraph ofii'ce routed message. -.-.tl1e; instant illustration, the code signals thus designated are A, figures shift, numbersignals identifying theeparticular station transmitting {the message, and thereafter '(not shown) the signalshavingtodo-with the particutial numbering subjectmatter tapes.

to the fragments Of tape illustrated in Figs. 6

and -'7 as is .helpful to indicate the typical mode of operation.

.Let it .besupposed that two control forms such asare indicated 92 and 93 are disposedi'in the manner illustrated in .-Fig. 4 with suitable tape reels Ior Supply and others for take-up for lleoth the message subject matter as wellas thesequen .Let .it be assumed also (as .an arbitrary starting .point that the transmitter has ,just completed the sensing of the lastniessagamatter character.cf.some.message on the control lform J93 .and that the figures shift signal 1.411 is instantly being sensed. This signal, .as .may be .noted .from 7, icomprises marking in the Nos. 1,.2, it, and 5 positions and spacing in the Ho. 3 position; Accordin ly, the bar .55 will beafiordcda selective clearance .due to the notches in the sections 54 of the .tapesensfing levers "4:5 and .it will,.lin,response to the urge of its spring, rise carrying with it the platform 1.32. As an efiectpf the .movement of platform 832 the latch .lever 123 will 'be raised and caused to rotate in a counterclockwise direction, Fig. 4, about its pivot "I29 disposing its opposite end 13.3 on the latching side of shoulder 136. 'The spring of latch i3 '5'will thereupon hold the latch lever 'lZB -in "the described poised position so that its overhanging'lip I2! will be clear of the shoulder Since, in accordance'with the nature of a figures shift signal, the No. 3 impulse auxiliary lever "l 38 will not, .at'this'timeibe permitted to rise due to the iblockingveffect ofsidewardly extending projection 139 of sensing lever 45,1atch 13.5 will not be tripped and the effect of holding latch lever .428 will accordingly not be interrupted. When, thereafter, cam assembly '23 describesanother cycle of rotation and cam Bl .encounters roller 53 thrusting .its lever .rightwardly, Rig. '4, the pivotal pin .l2'2 will be shifted to the right and then lide .IZI will be ,permitted to respond to its spring L24 moving ..rightwardly..until the transverse .loar 5| .of its selection probing lever 52 encounters one or moreof theiobstructions 4 9 that terminate the sensing ,levers 45.

'The resulting movement on the part of pin M9 will engageand .move lever 1| [.3 to the right opposing its individual spring but this extent of movement by pin 11:9 will :not engage and move lever. hit. Asthis .figures shift cycle is completed,-.cam .6! restores arm 125 {and the latter through pin .[22 returns .slide bar ill to its left where the mechanism remains in anticipation of a succeeding signal. At this return movement pawl H2 is withdrawn from supporting lug H8 which then drops a slight degree further until it comes to rest on shoulder N6 of pawl H3. It will be evident that pawl I I4 will now be blocked by lug H8 when it seeks to return. The several elements will, accordingly, remain in the position just described at the conclusion of the figures shift signal |4| and will thereafter respond as will now be described to the succeeding signal I42, which, as mentioned above, partakes of the characteristics of the alphabetical character J but is more accurately termed here the end-of-message signal.

When the feelers 45 sense the end-of-message signal, the proper clearance of obstruction lugs 49 will be had to permit the sensing bar to move leftwardly and hence its lever 52 to rotate counterclockwise thereby permitting the slide bar |2| during this signal an additional amount of movement to the right. When, thereafter, pin H9 moves to the right, it will engage lever H4 and rock the latter member counterclockwise about its pivot removing the final supporting shoulder ||1 from the sidewardly extending lug I|8 of bell crank 16. As a consequence, bell crank 16 will rotate clockwise to its full extent shifting rack 14 to the left and control shaft 1| in the same manner.

Meanwhile it is to be observed that when lever ||2 responds to the urge of its spring and moves in counterclockwise direction about its pivot I99 due to the movement rightwardly of pin H9, it is limited when it encounters stop I43 and that pin ||9 may move to an extent beyond engagement until both of the supporting projections H1 and H6 are withdrawn from the range of the sidewardly extending lug H8.

It is to be noted that the code combination for the letter J which has been chosen as an end-of-message control signal has no perforation in the No. 3 position so that accordingly, as a result of its selection, the special release lever I38 for tripping the latch I35 is again ineffective, permitting the latch lever I28 to remain in its poised position.

As a result of the succeeding operation of feeler levers 45, they encounter in the tape 93 the rubout signal combination I45, Fig. 7, whose characteristics include marking in all five positions. As a consequence of this selection the special lever I38 described above is now actuated due to the withdrawal of the blocking lug I39 of the No. 3 feeler lever 45. As a consequence, its lobe I31 engages the upright arm I36 of latch I35 rocking the latter member clockwise about its pivot and releasing latch lever I28 which had been held by obstruction with the shoulder I34 through the downwardly extending arm I33. The purpose in providing the several pawls for holding the transfer control pin 1| and its associated mechanism until the second cycle after the figures shift is to prevent the transfer of control from the message tape to the number tape until the message tape has been advanced to the all-marking position.

After slide bar I2! has moved to the right, lip I21 descends on the lug I26. Pin ||9 then encounters the lowermost extremity of lever H3 pushing the latter member away from its stop pin I44, shoulder H6 is withdrawn from support of the bell crank projection I I8, and spring I24 becomes effective to rock bell crank 16 clockwise about pivot 83 thrusting movable bar I4 leftwardly and shifting the control pin II from the position illustrated in Fig. 4 to a position slightly to the left thereof effecting a transposition upon the tape feed pawls 66 and 61 so that pawl 66 thereupon comes into engagement with its ratchet wheel 84 as pawl 61 is withdrawn from engagement with its ratchet wheel 81.

As a result of this transposition of tape feed ratchet wheel actuating pawls 66 and 61, the further reciprocal movement of arm 63 under the control of the tape feed cam causes the upper tape feed shaft 85 to be actuated instead of lower tape feed shaft 86. Accordingly, the tape 93 becomes arrested in position I 45, located opposite the feeler lever pins 41 while the upper tape 92 starts to be advanced in a step-by-step manner as will now be described.

Since there are provided perforations in all positions of the code combination I45 the feeler pins 41 are able to extend through the lower tape and probe for various code combination signals in the upper tape 92. The upper tape which had been at rest in the position designated I46, Fig. 6, new proceeds to be advanced so as to present the code combination of position I41 to the several feeler levers 41. Meanwhile, it is to be noted that on account of the selective operation of bell crank 16, that is, its actuation and consequent shifting of parallel bracket 14 leftwardly, the bent over extremity I48 of said bracket 14, Fig. l, is moved to the left a distance beyond that illustrated in Fig. 4 or to an extent so as to be located within the range of arm I25 of the above-mentioned sensing lever bail assembly actuated by the follower roller 59 when the latter is thrust rightwardly by its cam 6|.

Portion I48 is too low, however, to be engaged by the lowermost extremity of arm I25 at this time and the restoration of hell crank 16 which requires a thrust from the extremity of said arm I25 in the attainment of this object will await until bell crank 8| having the follower node I49 drops into one of the recesses I5I of the crown cam 94. This occurs after a certain number of steps have been imparted to the upper tape feed assembly including shaft 85 during which the code combination signals including the four numeral codes as indicated in Fig. 6 are transmitted, followed by the tWo rubout signals 52 and I46. Auxiliary ratchet wheel 95 which has an engageable tooth at spaced intervals only on its periphery will now become disposed so that one of its said teeth may be engaged by the special feed pawl 98 upon the latter members next ensuing reciprocation though such movement occurs after control of tape feeding has been restored to shaft 86. This movement of one step by shaft 85 advances cam 94 so that the nose I49 of hell crank lever 8| is forced out again resuming the position in which the element is illustrated in Fig. 4.

Thus, while the lower tape 93 will be understood to advance throughout a variable distance and relinquish its supervision only after the occurrence of the significant code combination order of figures shift signal followed by an end-ofmessage or character J signal, the uppermost control form 92 advances throughout a limited distance only and is automatically suspended by a characteristic forming part of its tape feed mechanism.

The effect of the figures shift code combination signal I41 during the supervision by control form 92 is to place the printing apparatus at the remote station in condition for printing figures instead of alphabetical characters, the characters followirigbeiiig of that class. Accordingly, the selector apparatus at the tape transmitter will undergo the preliminary selection as described in connection with this signal when transmitted by tape 83 andwill cause the latch lever I28 to be raised and momentarily held by the latch I35. This conditionof' latch lever I28 will not continue for long, however, because upon the occurrence of any .suc ceeding' code combinatiorrsignal having marking in theNo. 3 positiornlatch I35 will become actuated' coincident with the selective movement of lever I 38..and will restore latch lever I28 to normal 'When the transmitting apparatus becomes exhansted of message matter transmitting tape 93, and as a consequence of the control mechanism described in the patent referred to above, shaft 85 is arrested and restarting of transmission must then'be manually arranged by the depression of push bar I06 as already mentioned. above. Since this abeyance may also find the bell crank 16 in its extreme clockwise position, means have been provided including a projection I55 which terminatesthe lowermost extremity of push bar I06 and azrbell crank lever I53 pivoted at 54 and havin'gan arm. I551for engaging a pin extension on. pivot 15, Fig. 4. In this way, the depression of push. bar I06 causes arm I55 of bell crank I53 to be rotated in a clockwise direction to efiect the restoration of hell crank .16.

xThere will now .be described a modified adapte tion of the present invention featuredin Fig. 8 of the accompanying drawings and characterized bythe provision of a mechanism for permitting the control form 92 to maintain supervision of. the transmitter foran indefinite period of time in lieu of theflprescribed limited motion under control of the crown cam 94 or, otherwise stated. for supervising the transmission under the control of form 92- for a variable time orv until such a time as this transmission is-relinquished under the control of a special marking carried by said. form 92.

Throughout the major portionof the apparatus, a general resemblance may be noted between the mechanism of Fig. 8 and thatof Figs. 1 to 5. As in the preferred embodiment, there are provided three control levers I I 2, I13, and I 14, all actuated by a pi H9 carried as an integral part of the horizontal slide bar lZI. Also, as in the case of the preferred form, a bell crank member 16 giving support. to a control pin 'II predetermines the relatitre shifting arrangement between a pair of pawls B and 61 by means of which step-by-st'ep motion is alternatively communicated to one or theother of the tape feed shafts 86 and 85.

From the disclosure in connection with the preferred embodiment, it will be clear how the supervision under the control of the message matter tape 93 may be shifted to that of the auxiliary tape '92. This tape will now be referred to as auxili'ary tape since in its present embodiment it may have utility other than that of supplying a fixed numberof signals such as is true of a numbering system but may instead supply information of varyinglengths such as addresses, names, etc. The auxiliary tape 92 is guided through an inclined supporting table I 51 giving support to the under surface of the tape 92 and particularly so in the region designated I58 whereat the nose I 59 oiaprobinglever I-BI' is intermittently appliedin searchof a specialperforation such as asixth hole ermargi-nal notch as may be preferred, in accordance with which the termination of supervision by form- 92 is predetermined, Lever I 6.1 is. pivotaily articulatedas at I62 to a link 18- generally r'esem blingthe .corresponding.member in the preferred embodiment except that inthis instance link 18 is provided with .a'pin 53 which lies in the path of a horizontal extension. I64 integrallyformed with the sensing lever restoration bail 51. The feeler levers are cyclically returned in a clockd irection about their pivots 46 when the restoration ball 5.] is actuated by its cam roller 59 under the supervision of a cam BI. The motion on the part of bail 51 is clockwise about shaft 46 as a pivotand accordingly, its extension I'B4'Wil1 be understood to describe a rotary rolling motion imparting a downward. stroke to the pin I63 and accordingly to the link 18.

As a result lever I6] is rotated in a counter clockwise direction about its pivot I66 withdrawing the feeler extremity I59 -from the region I58 but after the effect of cam. GI a spring IBlrestores the link 158 and lover Ifil whereupon the follower projection I59 is reapplied to the surface of the tape in search of the message terminating perforation. When such a perforation-is encoum. cred, lever Mil will hepermitted to rotate in a clockwise direction about pivot Hit to such an extent as to raisepivot l1 and the leftward ex-' tremity 8 of bracket It into the path of arm I25, as'in the case of the preferred'embodi merit-"of thisv structure. Thereupon a succeed ing rightward motion on the part ofarm I25 thrusts bracket 64 to the right returning control pin '[I to its. extremeright position and rocking bell crank lever 'I-B back to its normal, Fig. 8, position.

Supervisory control pin H is situated between the two tail portions 88 and 69 of the ratchet wheel feed pawls 6'6 and 6! just as in the case of Figs; 1' to 5. As; a consequence, the rightward movement imparted. by arm I25 causes the pin II to shift feed pawi 66 out of engagement with its associated ratchet wheel on shaft while permitti-ng feed pawl-61: to be moved into engagement with its ratchet wheel on shaft 88. Thisrestores supervision to the principal control form 93. which undergoes: continuous supervision until it in turn encounters the prescribed changeover signals as in the case of the preferred embodiment.

- It is to be understood that as with the case of the preferredmodificati-on, the upper tape 92 must be spent or must be arrested in a condition in which all of the code perforations are marking in order thattape sensing pins 45 may be effective on the lower tape and that likewise the lower tape must be so effected in order that the sensing levers 5 maybe under the supervision by the. upper When so employed, the auxiliary tape 92 may bewithheld from control and may, therefore, represent .a rush message that is inserted by arresting the transmission of tape 93 art .a point where all perforation signals are provided following which the aoxiliarycontrol form 9'2 takes over and continues; until the rush message has been transmitted; w

Upon the restoration of lever I6, its sideward- 1y extending log .I I8 is replaced on the uppermost shoulder Hi9 and supervision may then not be takenirom the tape-93 until the manual operation oflever [6&1 has again been :efiected. Under the conditions. of operation, lever 16;

may sense a special perforation in the control form 92 or it may sense the end of control form 92, either event having the same result of restoring supervision to the primary control form 93.

While the present invention has been explained with reference to specifically disclosed embodiments, it is to be understood, nevertheless, that changes and modifications may be invoked without departing from the essential spirit or scope thereof. It is, accordingly, not intended to be limited by the details in the accompanying drawings nor by the specific recitations in the foregoing description except as indicated in the here unto appended claims. 1

The invention claimed is:

1. A transmitter apparatus comprising, a plurality of step-by-step form feeding devices, a common form sensing device, and means responsive to the signals sensed by said common form sensing device to concurrently arrest one of said form feeding devices and initiate the operation of another of said plurality of form feeding devices.

2. An automatic control apparatus comprising, a plurality of control tape feeding devices for advancing individual tapes, means associated with each of said devices responsive to certain code settings in the associated tape to suspend its own operation and to concurrently initiate the operation of another of said plurality of tape feeding devices, and a common sensing apparatus for sensing the code settings in all of the tapes associated with said plurality of control tape feeding devices.

3. In an automatic tape controlled telegraph transmitter, a pair of tape feed sprockets rotatable in opposite directions to propel respective perforated signal bearing tapes through a common sensing zone, a reciprocating power means for imparting rotation in step by step manner to one or the other of said pair of sprockets and means associated with each of said sprockets for coupling said power means to the other of said sprockets to thereby shift the control thereto and for concurrently uncoupling said power shaft from its own tape feed sprocket.

4. In an automatic transmitter for a permutation code telegraph system, a pair of independent tape feed sprockets rotatable in opposite directions, a common power source for operating each of said sprockets selectively in its direction, and

means identified with each one of said sprockets and responsive to a signal carried by its tape for coupling said power source to the other one of said sprockets.

5. In a selector apparatus, an element to be selected upon'the occurrence of two predetermined signals, a first latch member normally latching said element responsive to the first predetermined signal for releasing said element and thereby initiating selection thereof, a second latch member operating to latch said element upon the release of said first latch member responsive to the second predetermined signal for completing the selection of said element, and means for re'- latching said first latch member following its release signal when a succeeding signal is other than that for selecting said second latch member.

6. In a tape transmitter, two tape feed mechanisms, a reciprocating power member for actuating said mechanisms, a control device for coupling said power member with either one of said tape feed mechanisms selectively comprising means responsive to a tape signal for coupling said member to one of said mechanisms, and means responsive to a predetermined number of steps of one of said mechanisms for coupling said member to the other one of said mechanisms.

'7. In a tape transmitter, two tape feed mechanisms disposed in a common plane so as to direct separate corresponding tapes through a common course, a reciprocating member for ac tuating either of said mechanisms exclusively, a control device for coupling said member to one or the other of said mechanisms selectively comprising means responsive to a tape signal for coupling said member to one of said mechanisms, and means responsive to a, predetermined num ber of steps of said one of said mechanisms for coupling said member to the other one of said mechanisms.

8. In an automatic tape transmitting apparatus, two independently operative tape feed mechanisms, 3, source of power for actuating said mechanisms, a coupling device for imparting rotary power from said source to either one of said tape feed mechanisms selectively comprising means responsive to a signal condition in a tape under the control of one of said mechanisms for coupling said power to the other one of said mechanisms, and means under the control of a sequence of operations of said other one of said tape feed mechanisms for coupling said source of power to said one of said tape feed mechanisms.

9. A tape transmitting apparatus for alternately operating from one or the other of a primary or secondary tape comprising in combination a primary tape feed apparatus, a secondary tape feed apparatus, a common tape sensing and electrical signal generating device controlled by either of said primary or secondary tapes, means responsive to a coded area on said primary tape for suspending the further operation of said primary tape feed apparatus and for concurrently initiating into operation said secondary tape feed apparatus, and means responsive to a coded area on said secondary tape for arresting the further operation of said secondary tape feed apparatus and for concurrently initiating into operation said primary tape feed apparatus.

10. A tape controlled apparatus for alternately operating from one or the other of a primary or secondary tape comprising in combination, a primary tape feed apparatus, a secondary tape feed apparatus, means responsive to a coded area in said primry tape for suspending the further operation of said primary tape feed apparatus and for initiating into'operation said secondary tape feed apparatus, and means responsive to a coded area in said secondary tape for arresting the further operation of said secondary tape feed apparatus and for initiating into operation said primary tape feed apparatus.

11. In a telegraph transmitting apparatus, a set of form feelers, two form feeding mechanisms, means to arrest either one of said form feeding mechanisms in a position whereat its associated form presents an all-perforated area condition to said set of feelers, and means responsive to said all-perforated area for concurrently starting into operation the other one of said two form feeding mechanisms.

12. In an automatic telegraph transmitter, a first form feeding mechanism, a second form feeding mechanism, a sensing mechanism common to said first and said second feeding mechanisms, means to place the sensing mechanism under control of said first form feeding mechanism, automatic means to transfer the control from the first form to the second form at recur- 17 ring intervals, and manual means to permit or prevent the transfer.

13. In a serial numbering system for automatic telegraphs, a control tape carrying a succession of serial number code marks, a control tape carrying code marks representing messages, a single sensing mechanism, and means for causing said sensing mechanism to be controlled alternately by the message tape and by the number tape; whereby alternate message number and messages are transmitted.

14. In a transmitter, a single code sensing mechanism having a sensing locus, means to advance a control form through the sensing locus, means to arrest the motion of said control form, means to advance a second control form through the same sensing locus superimposed on the first control form, means to render said sensing mechanism operative to interpret the second control form only, and means to subsequently render said sensing mechanism operative to interpret only the first control form.

15. In a transmitter, signal transmitting means, a control form, means to advance the control form to control the transmitting means to transmit a succession of signals represented by successivecoded areas on the form, means to insert a second similar cont'rol form in the transmitter and condition it for advancement, means to arrest the advancement of the first control form and tranfer the transmitter control from the first control form to the second control form, and means to transfer the control back to the first control form after a predetermined interval of control by the second control form.

16. In a transmitter, a signal transmitting means, a control strip, means to advance the strip through the transmitter to control said transmitting means, means to advance a second similar control strip through the transmitter, means to control said signal transmitting means'by the second strip while the first strip is still in position ready to be advanced but ineffective to control said transmitting means, and means to return the control to the first strip.

17. In a transmitter, trafnsmitting means, a control strip, means to advance the control strip through the transmitter, means to control the transmitting means according to coded areas on the strip, a second control strip, means to insert the second control strip in the transmitter, manual means to precondition the transmitter for automatically advancing the second strip,. and signal control means to transfer the control of said transmitting means from the coded areas on the first strip to the coded areas on the second strip only after the manual means has been operated.

18. In a tape transmitter operating from a pair of tapes, a common tape sensing mechanism, tape feed means individual to each of the tapes, only one of the tapes being fed at any one time, and means responsive to predetermined code signals in the tape currently being advanced as sensed by said common tape sensing mechanism to disable said tape feed means associated with that tape and to initiate operation of the said tape feed means associated with the other of the tapes.

19. In a tape transmitter operating from a pair of tapes, a .common tape sensing mechanism, tape feed means individual to each of the tapes, only one of the tapes being fed at any one time, means responsive to predetermined code signals in the tape currently being advanced as sensed by said common tape sensing mechanism to disable the tape feed means associated with that tape and to initiate operation of said tape feed means associated with the other of the tapes, and means op erating after said tape feed means associated with the other of the tapeshas caused the tape to be advanced a predetermined distance to disable that tape feed means and initiate operation of said tape feed means associated with the tape initially advanced.

2!). In a telegraph transmitter, a common sensing means having a sensing locus, feed means to advance a control form through the sensing locus, a second feed means to advance a second control form through the sensing locus, and means responsive to coded areas in said control form to determine which of the said feed means is to be operated.

21. In a telegraph transmitter, means to transmit code signals, a common sensing mechanism having a sensing locus, feed means to advance a control form through the sensing locus, a second feedmeans to advance a second control form through the sensing locus, and a common means for operating both said feed means, said common means operating under the control of said forms in such a manner that only one of said feed means will be operated at any one time to advance its associated control form through the sensing locus.

22. In a telegraph transmitter, means to transmit code signals, a common sensing mechanism having a sensing locus, feed means to advance a control form through the sensing locus, a second feed means to advance a second control form through the sensing locus, a common means for operating both said feed means, said common means operating in such a manner that only one of said feed means Will be operated at any one time to advance its associated control form through the sensing locus, and means responsive to predetermined signals in the tapes to control the operation of said common means for operating both said feed means.

.23. In a transmitting apparatus, a plurality of form feeding mechanisms, a separate control form having coded areas engaging each form feeding mechanism, a single form sensing means to generate signals under the control of any one of the forms, and means controlled by predetermined ones of the coded areas to transfer the control from one form to another.

24. In a telegraph transmitter, a first form feeding mechanism, a second form feeding mechanism, a sensing mechanism common to said first and said second form feeding mechanisms for sensing a control strip passing therethrough, and means to control the effectiveness of one or the other of said form feeding mechanisms.

25. In a telegraph transmitter, a first tape feeding mechanism for feeding a tape therethrough,

mechanisms.

LOUIS M. POT'I'S.

REFERENCES CITED The following references are of record in the file of this patent:

(References on follow n P UNITED STATES PATENTS Number Name Date Watson Aug. 9, 1932 Lang Feb. 1, 1938 Carr May 10, 1938 Levy Sept. 13, 1938 Walker Apr. 18, 1939 Anderson Sept. 12, 1939 Number Certificate of Correction Patent No. 2,451,045. October 12, 1948.

' LOUIS M. POTTS It is hereby certified that errors appear in the printed specification of the above numbered patent requiring correction as follows:

Column 16, line 1, claim 6, before the word one insert said; line 63, claim 11, after area strike out condition; I and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 17th day of May, A. D. 1949.

THOMAS F. MURPHY,

Assistant Oommz'ssz'oner of Patents. 

